Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae096287df685797…

MALICIOUS

PDF

72.3 KB Created: 2021-09-21 09:16:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 39c90586158721cdac60feccf82105e6 SHA-1: 8574e4cf88d448c93137af5c1147a66de0eb60e0 SHA-256: ae096287df6857974839a1135a4865ac6d4f615a7e7806efe586fa9af10a101e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates these URLs are likely on disposable hosting and used for SEO manipulation, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://archism.ru/uplcv?utm_term=all+i+want+is+you+guitar+tab PDF link annotation
    • http://keystoparadise.com/userfiles/files/52535206574.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613282877060d---zubibas.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/58932244853.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210921071718.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/82517681826.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/60458373938.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/kujovap.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/86632424064.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/95852428982.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903101819458630.pdfIn PDF document text
    • https://upaspor.com/resimler/files/84506246020.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/65379876715.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/28898274099.pdfIn PDF document text
    • https://leganordavigliana.com/uploads/file/3610207979.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/gitunagosiwora.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16145294ec2c05---28666462669.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/69247944871.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/sipuzo.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/sidukinetabopalewegup.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/jusopadiduvixalazebupe.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/72934630568.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 16764 bytes
SHA-256: 80aae8c2af118426f191c212b71c9d654e9208b4237355d9438efd049e1b3129
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10572 bytes
SHA-256: be3e0d94a604556bf9e6ce585410a36ee0d9a3009efd87445ad46f40051d85e9

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